Local evolution of obligate autogamy inEpipactis helleborine subsp.neerlandica (Orchidaceae) |
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Authors: | H Æ Pedersen B K Ehlers |
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Institution: | (1) The Botanical Museum, University of Copenhagen, Gothersgade 130, DK-1123 Copenhagen K, Denmark;(2) Department of Genetics and Ecology, Institute of Biological Sciences, University of Aarhus, Ny Munkegade, Building 540, DK-8000 Aarhus C, Denmark |
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Abstract: | Isozyme analysis was used to assess the origin of the DanishEpipactis renzii, a local endemic of open coastal dunes. It seems to have evolved recently in several local populations of the more or less allogamousE. helleborine subsp.neerlandica. The obligately autogamousE. renzii is restricted to the easternmost part of the Danish range ofE. helleborine subsp.neerlandica, indicating that transition to obligate autogamy has been a selective advantage in that area. This may be explained by water stress, caused by a higher evapotranspiration (cf. the mean temperature of July which increases towards the east) — obligate autogamy shortens the time span from anthesis to fruit set due to a rapid pollination process. We propose thatE. renzii should only be recognized as a variety ofE. helleborine subsp.neerlandica. |
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Keywords: | Orchidaceae Epipactis helleborine subsp neerlandica speciation breeding system pollination isozymes |
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